/*
 * ext-helloworld.js
 *
 * Licensed under the Apache License, Version 2
 *
 * Copyright(c) 2010 Alexis Deveria
 *
 */
 
/* 
  This is a very basic SVG-Edit extension. It adds a "Hello World" button in
  the left panel. Clicking on the button, and then the canvas will show the
  user the point on the canvas that was clicked on.
*/
 
methodDraw.addExtension("Hello World", function() {

    return {
      name: "Hello World",
      // For more notes on how to make an icon file, see the source of
      // the hellorworld-icon.xml
      svgicons: "extensions/helloworld-icon.xml",
      
      // Multiple buttons can be added in this array
      buttons: [{
        // Must match the icon ID in helloworld-icon.xml
        id: "hello_world", 
        
        // This indicates that the button will be added to the "mode"
        // button panel on the left side
        type: "mode", 
        
        // Tooltip text
        title: "Say 'Hello World'", 
        
        // Events
        events: {
          'click': function() {
            // The action taken when the button is clicked on.
            // For "mode" buttons, any other button will 
            // automatically be de-pressed.
            svgCanvas.setMode("hello_world");
          }
        }
      }],
      // This is triggered when the main mouse button is pressed down 
      // on the editor canvas (not the tool panels)
      mouseDown: function() {
        // Check the mode on mousedown
        if(svgCanvas.getMode() == "hello_world") {
        
          // The returned object must include "started" with 
          // a value of true in order for mouseUp to be triggered
          return {started: true};
        }
      },
      
      // This is triggered from anywhere, but "started" must have been set
      // to true (see above). Note that "opts" is an object with event info
      mouseUp: function(opts) {
        // Check the mode on mouseup
        if(svgCanvas.getMode() == "hello_world") {
          var zoom = svgCanvas.getZoom();
          
          // Get the actual coordinate by dividing by the zoom value
          var x = opts.mouse_x / zoom;
          var y = opts.mouse_y / zoom;
          
          var text = "Hello World!\n\nYou clicked here: " 
            + x + ", " + y;
            
          // Show the text using the custom alert function
          $.alert(text);
        }
      }
    };
});

